Level Meter for 12 LEDs
Functions and Features
.
Bar-shaped display of input level by means of 12 LEDs.
.
High-order 5 dots with peak hold.
.
Built-in oscillator for peak hold reset. Requires 1pce each of
external C, R. Uses either oscillator at the time of stereo
operation. Also capable of resetting manually.
.
Capable of constant-current driving low-order 7 dots (green
LED). Constant-current value variable with an external
resistor.
.
Lower current drain available by connecting green LEDs in
series.
.
Built-in input amplifier.
.
Requires no other light-up level adjustment than adjustment
for 0 dB. D1 error: Within
3 dB of 20 dB
.
Supply voltage range: 10 to 16 V
Package Dimensions
unit : mm
3045B-MFP24
[LB1412M]
SANYO : MFP24
Specifications
Absolute Maximum Ratings
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
Pin 16
0.3 to +18
V
Output current
I
OL
Pins 2 to 6: D8 to D12, output on
30
mA
Allowable power dissipation
Pd max
Ta = 60C
380
mW
Operating temperature
Topr
30 to +75
C
Storage temperature
Tstg
40 to +125
C
Allowable Operating Range
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage
V
CC
10 to 16
V
Ordering number: EN1593B
Monolithic Digital IC
LB1412M
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
53096HA(II)/9087KI/9134KI,TS No.1593-1/5
Electrical Characteristics
at Ta = 25C, V
CC
= 12 V
Parameter
Symbol
Pin No.
Conditions
min
typ
max
Unit
Input bias current
Amp (1)
I
BIN1
8
3
0.2
0
A
Output saturation
voltage
Amp (1)
V
OH01
9
Pins 9, 10 short
10.5
11.2
11.6
V
Amp (1)
V
OL01
9
Pins 9, 10 short
1.0
1.5
2.0
V
Voltage gain
Amp (1)
V
GA1
30
100
dB
Input resistance
Amp (2)
R
IN2
10
8
12
16
k
Load resistance
Amp (2)
R
02
11
35
50
65
k
Output current
Amp (2)
I
OL02
11
3
6
12
mA
Voltage gain
Amp (2)
V
GA2
1.8
2.0
2.2
times
Output current
I
OL
17, 21
D1, D5: 3 k
across V
Z
and I
LED
13
17
20
mA
Output saturation voltage
V
sat
18, 19,
20, 22,
23
D2 to D4, D6 to D7: output
transistor on across V
Z
and I
LED
1.0
1.3
V
V
sat
2 to 6
D8 to D12: I
OLD1
to D5 = 30 mA
1.5
2.0
V
Output leak current
I
off
17, 21
D1, D5: output transistor off
0
30
A
I
off
2 to 6
D8 to D12: output transistor off
0
30
A
Comparator level
D8
V
THD8
2
D8: Voltage to turn on D8 by
applying DC voltage across V
Z
and
IN2
0.625
0.55
0.465
V
D1
G
D1
17
D8 light-up level: 0 dB
23
20
17
dB
D2
G
D2
18
D8 light-up level: 0 dB
17
15
13
dB
D3
G
D3
19
D8 light-up level: 0 dB
12
10
8
dB
D4
G
D4
20
D8 light-up level: 0 dB
8
7
6
dB
D5
G
D5
21
D8 light-up level: 0 dB
6
5
4
dB
D6
G
D6
22
D8 light-up level: 0 dB
4
3
2
dB
D7
G
D7
23
D8 light-up level: 0 dB
1.5
1
0.5
dB
D9
G
D9
3
D8 light-up level: 0 dB
0.5
1
1.5
dB
D10
G
D10
4
D8 light-up level: 0 dB
2
3
4
dB
D11
G
D11
5
D8 light-up level: 0 dB
4
5
6
dB
D12
G
D12
6
D8 light-up level: 0 dB
7
8
9
dB
Reference voltage
V
Z
13
3 k
across V
Z
and I
LED
5.6
6.3
6.8
V
R pin flow-out current
I
OLR
12
V
R
= 0 V, OSC pin open
0.6
0.3
0.1
mA
R pin voltage
V
R
12
OSC pin open
0.4
0.7
0.9
V
Oscillation frequency
f
OSC
14
1 M
, 2.2 F across V
CC
and V
Z
1.5
2
2.5
s
Current drain
I
CC
16
3 k
across V
Z
and I
LED
, all D
outputs off
9
15
mA
Allowable
power
dissipation,
Pd
max
m
W
Pd max Ta
Ambient temperature, Ta C
LB1412M
No.1593-2/5
Pin Assignment
Equivalent Circuit Block Diagram
Unit (resistance:
, capacitance: F)
Oscillator
Constant-
current driver
Constant-
current driver
V
CC
10 to 16 V
LB1412M
No.1593-3/5
Sample Application Circuit
For sample application circuit :
1.
The LB1412M consists of the following blocks.
.
Input amp 1: Amplification of input signal, variable with external constants
.
Input amp 2: Amplification of signal (fixed, double), detection of signal
.
Reference voltage : Reference voltage of comparator, constant-current drive of LED
.
Comparator : Comparison of input voltage
.
LED driver : LED drive, D1 to D7: Constant-current drive
.
Peak hold circuit : Hold of highest-order point of high-order 5 points (D8 to D12)
.
Oscillator for peak hold reset : Peak hold circuit reset
2.
Description of constants of each block
2-1 R3, R4 (R11, R12)
The gain of amp1 depends on R3, R4. Gain of amp 1 = R3/R4 times. The gain of amp1 must not exceed 4 times
(12 dB). R3 + R4
6 100 k
(C4 = 4.7 F).
2-2 C2, C3 (C5, C6)
C3 is for coupling amp 1 with amp 2 and its value is 1 F. C2 is for controlling the time to turn off LED.
2-3 R2 (R10)
The current of LEDs connected to D1 to D7 depends on R2. The current is stabilized to be approximately 17 mA at
R2 = 3 k
and approximately 11 mA at R2 = 4.7 k
.
2-4 R5 to R9 (R13 to R17)
The current of LEDs connected to D8 to D12 depends on these resistors. D8 to D12 pins are collectors of Darlington
transistors.
I
D8 to D12
=
V
CC
V
sat D8 to D12
V
FLED
R5 to 9
6
V
CC
3.5 V
R5 to 9
I
D8 to D12
is approximately 4 mA at R5 to 9 = 2.2 k
.
Unit (resistance:
, capacitance: F)
Note : Input signal of approximately 110 mVrms causes D8 (0 dB display) to light.
R5 2.2 k
R6 2.2 k
R8 2.2 k
R7 2.2 k
R9 2.2 k
10
to
16
V
LB1412M
No.1593-4/5
2-5 Reset pin (Pin 12)
When the reset pin is open, peak hold of D8 to D12 occurs. When the reset pin is connected to GND, reset occurs.
Connecting the reset pin to GND causes no peak hold.
2-6 C1, R1
The oscillation cycle of oscillator depends on the product of C1 and R1. The oscillation cycle at C1 = 2.2 F, R1 = 1 M
is
approximately 2 seconds. However, if an electrolytic capacitor is used for C1, the actual capacitance differs from the marked
value.
2-7 Reduction in number of parts
R3, R4, VR1 are substituted by one VR.
Unit (resistance:
, capacitance: F)
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use
or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of May, 1996. Specifications and information herein are subject to change without notice.
LB1412M
No.1593-5/5
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